Automatic control for crushing machines



w. W. GUEST Filed Dec. 6, 195o July 24, 1934.

AUTOMATIC CONTROL FOR CRUSHING MACHINES Y Al.,

f Puentes July 24, 1934 l 1,961,240

1,901,240 e AUTOMATIC CQNTROL FOB CBUSHINGA momes William W. Guest. Los Angeles, Calif., assignorto Mary/. Guest. Los Angeles. Calif.

` appueauengbeeembee e, me, serial Ne. seam f 4 claims. (ci. sa-ssi Myinvention relates generally torock crushing -ot my invention. designates the trame of a machines of the type disclosed inmyvco-pending yielding jaw rock crushing machine. 1i the hopapplicatlon for U. S. Letters Patent illed May per thereof. 12 the swinging jaw that is operated 26, 1930, Serial No. 455.793, and more particularbyan eccentric 13 and 14 the yielding jaw.

6 1y to an automatic control or switch actuatingde- The crusher is operated in the conventional so vice. and the principal object of my present inmanner by an electric motor (not shown). vention is, to provide relatively simple, practical Formed throllsh the lOwer DOItiOn 0f frame 10. and efncient means for actuating a switch in the to the rear o! the lower end of iaw 14.18 an openy electric connections that lead from a source o! i118 15rthl'0ll3h which Wees the 8911118 cushionl liicurrent-supply to the electric motor that operates tht Yleldingly ODDOeeB the Outward lwiniinil 65 the crushingmachine and which control orswitch mOYement 0f the yielding jawactuating means functions as a safetyfactor, in Supported in any suitable manner, preferably that it operates automatically in the event that a by bOItB "met Project outwardly from the frame e piece of uncrushable material or a foreign object f the machine adjacent to the ends of the opensuch as a piece of metal enters the machine and in! 15, l! Sprint beim 16, against which bear 70 passes between the jaws thereof. the outer ends of relatively stiif expansion springs L 1n the operation gf rock crushing mmm, 11; i7. which constitute the resilient members of the sometimes happens that an uncrushable v'object Sprint cushion. These epringpassthrough openor piece of material passes between the crushlng 15 in frame 10 and their inner ends rest upon ing Jaws, with the result that said Jaws, or other. ythlt plete 13 that is DivOtlly oonneeted to 75 parts of the machine are distorted or :broken and thelliwel` mr 130111011. 0f 18W 14- it is the purpose of my invention to provide a de- Rods 19 extend from the thrust plate through vice that act automatically in the event that the springs 17 and through the spring beam 18 the jaws encounter a piece of uncrushable mateand the threaded ends of the rods thatl project gg rial and which device cuts out the electric motor beyond the spring beam receive nuts 20. so

` that drives the crushing machine, consequently secured in any suitable manner to the center preventing breakage in themachineV and elimiofthrust plate 18 and projecting outwardly therenating loss of time and cost of repairs andl refrom'is a fork 2i, to which is pivotally connected placements. y the inner end o! a distance rod 22,1 the outer end ,o runner objects of' my invention are. wenn portieri'uiereef being vprovieeciuwiui a threaded 85:

vide an automatic control device that 'is assoaxialbore 23. l

ciatedwith the spring cushion that yieldingly rel Bcrew seated in said bore isthe threaded inner sista the outward movement of the yielding Jaw portion of a rod-24 and the outer end portion of of the crushing' machine and. iurthen to'provide thisrod is arranged for sliding movement in an in thscontrol device, anadiustment whereby the aperture 25. that is formed through spring 90- operation ofsaid control device may be very acvbeam 16; i

curately controlled and regulated, The lower half of the' outer endportion of rod Withthe foregoing andother obiectsin view, 24 is cut awayso'as toprovide a relatively shortl my invention consists in certain novel features yilat underi'ace 26 and formed in the'outer end of 40 ofoonstmctionandarrangementotpartsthatwilisaid rod is a abort slot 2'! thatia adapted to-re- 95 4 hereinafter be more fully described'and claimed ceivethepoint of vascrew driveror liketool when andillustntedmtbsaecompanyingdrawingin said rod is adiusted in rod n'by' which: screwingsaidroduintooroutofsaiddistance Il'ig.1isaverticalsectioutakcuthrough-the"roth-f v centeno! a yielding'ljaw rock crushing machine A portion Iot theiaw immediately to therear 100 and showing my improved automatic cutoftand of theiiatfaceidiscutawayto-formaiiatundercontrolassociatedwiththespringeushionthereot. face 28 thateis. somewhat longer than face 26 vlli'ig. 2 is an enlarged vertlcalleetion taken andformed'between-saiddatunderfacea2i!and'v' m thccenter of the spring cushion and :aisan'inclinedface m. a ma cutoff. l :Arrangedinthelowerportionofthespringlos Fig. B'isaperspectiveview-odtheouterendof beam 16 directlybeneath the center of aperture anadiustablerodthatformsapartoi'theautoisaverticallydisposedhousingmwithinwhich matic cuto. is arranged for sliding movement. a plunger 31 Referring by numerals to the accompanying and projecting upwardly from this plxmger into l55;drawingwhiehillustratea'apracticalembodiment theapertureia'astema. 'Iheupperendof no this stem normally engages the nat underface 26 oi.' rod 24.

Depending from plunger 21 is a stem 33 that extends through a bushing 34 that is seated in the lower end of housing 30 and arranged on said stem 33 between the upper end of said bushing and the underside of plunger 31 is an expansive coil spring 35. e

Arranged on the underside of spring beam 16 is a cover or box 36 within which is located a switch 37, to which'latter is connected the conductors forming the circuit between the source of electric current supply and the motor that operates the crushing machine and projecting upwardly from said switch and disposed directly below the lower end of the stem 33, is a switch arm or plunger 38.

Under normal operating conditions, rod 24 is adjusted in the distance rod so that the upper end of stem 32 that forms a part of the switch actuating plunger, bears against the at underface 26 on said rod and as long as the crusher performs its intended functions, the ilat underiace 26 rides backward and forward upon the upper end of the stem 32 as the yielding jaw vibrates within its normal limits.

Should an uncrushable piece of material or a piece of metal such as a clipper tooth pass from the hopper 11 into the space between the jaws, the yielding jaw 14 will be moved abnormally outward against the resistance offered by the spring cushion and such movement effects a depression of the plunger 31 as the upper end oi' stern 32 rides downwardly on the inclined face 29 and into the flat face 28, suchaction occurring as the result of the abnormal outward sliding movement of rod 24 and which latter is carried by the distance rod 22.

-As a result of the depression of the plunger, the lowerend of stem 33 engages switch arm or plunger 38 and forces the same downwardly to open switch 37, thereby cutting oil the current supply to the moto'i` that operates the crusher with the result, that the latter ceases to function and consequently avoids breakage and distortion of parts due to the presence of the uncrushable object between the jaws.

After the uncrushable object has been removed from the Jaws, the switch 3'1 automatically returns to its closed position under the influence of a spring associated with arm or plunger 38 and the spring 35 actuates the plunger as the lower portion of the yielding jaw moves inward so as to reposition the flat face 26 directly aboveI the upperend of stem 32.

The position of rod 24 having the rlat underiace 26 may be readily adjusted so as to regulate and control the switch throwing operation by.

abnormal conditions arising from the entrance of an uncrushable piece of material or a foreign object such as a piece oi.' metal, into the space between the jaws oi.' the crusher.

It will be understood that minor changes in the size, form and construction of the various parts of my improved automatic control for crushing machines may be made and substituted for those herein shown and described without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

- I claim as my invention:

1. The combination with an electric motor operated crushing machine and its yielding jaw, of a spring cushion connected to the lower portion ofthe yielding jaw for yieldingly resisting movement-of said jaw away from the swinging jaw, a xed beam that is engaged by the rear portion ot said spring cushion, a switch carried by said beam and located in the electric circuit to the motor that operates the machine, an adjustable rod arranged in the spring cushion and a spring held plunger arranged for operation in said beam and adapted to be actuated by said rod for operating said switch.

2. In an electric motor operated crushing machine having a yielding Jaw, a fixed beam, an electric switch mounted on said beam, which switch is located in the electric circuit to the motor that operates the machine and a spring cushion arranged between the yielding jaw and the ilxedvbeam, a rod connected to said spring cushion for longitudinal movement therewith,

a portion of which rod extends into the fixed beam and a plunger arranged for sliding movement in said fixed beam, which plunger is adapted to be engaged by said rod and moved so as to actuate said electric switch as a result of abnormal outward movement of ,the yielding Jaw and spring cushion.

3.'In an electric motor operated crushing machine having a yielding jaw, a. ilxed beam, an electric switch mounted on said beam, which switch is located in the electric circuit to the motor that operates the machine and a spring cushion arranged between the yielding jaw and the ilxed beam, an extensible rod pivotally connected to said spring cushion for longitudinal movement therewith, a portion of which rod extends into the fixed beam and a plunger arranged for sliding movement in said ilxed beam, which plunger is adapted to be engaged by said rod and moved so as to actuate said electric switch as a result oi' abnormal outward movement of the yielding jaw and spring cushion.

4. The combination with an electric motor driven crushing machine having a spring cushion resisted yielding jaw and a switch located in the circuit in which the driving motor of the crushing machine is located, of a spring heid plunger for actuating said switch and a member connected to the spring cushion of the yielding Jaw of the machine and movable therewith for actuating said plunger and opening said switch in the event of abnormal movement of the yielding Jaw.

WILLIAM W. GUEST. 

